IGCT assembly structure for converter valve

Abstract

The invention belongs to the technical field of direct-current power transmission, and discloses an IGCT assembly structure for a converter valve, and the structure comprises a valve assembly and a press-fitting part which is used for carrying out the press-fitting and fixing of the valve assembly. The valve assembly comprises n IGCT devices, n + 1 water-cooled radiators, 2n static voltage-sharing resistors, n lightning arresters and 4n damping resistors. The n IGCT devices and the (n + 1) water-cooled radiators are arranged in a stacked manner; the 2n static voltage-sharing resistors and the 4n damping resistors are arranged on the water-cooling radiator; and each lightning arrester is connected with the water-cooled radiator through the first connecting busbar. According to the valve assembly, the IGCT device is used, the problem of commutation failure of the direct-current power transmission technology is solved, meanwhile, the IGCT device is a full-control device, control over switching-on and switching-off is achieved, when a direct-current system breaks down, the valve assembly can also be used as a direct-current circuit breaker, and controllability is high; devices of the valve assembly are distributed on the water-cooling radiator, and the heat dissipation function of the water-cooling radiator is fully utilized.

Description

Technical Field

[0001] The present invention belongs to the technical field of DC power transmission, and particularly relates to an IGCT component structure for a converter valve. Background Art

[0002] In recent years, multi-terminal DC systems have developed rapidly. Currently, multiple high-voltage DC power transmission projects have been constructed and put into operation, and DC voltages and transmission capacities are distributed at various levels.

[0003] With the development of power electronics technology, the technology of high-voltage DC (LCC-HVDC) power transmission systems based on thyristor technology, namely Line Commutated Converter (LCC), has been very mature. Currently, LCC-HVDC power transmission systems are widely used in occasions such as long-distance and large-capacity power transmission, and asynchronous grid interconnection.

[0004] Due to the high requirements for the connected AC grid for commutation, the high-voltage DC (LCC-HVDC) power transmission system based on thyristor technology has defects such as commutation failure on the inverter side, inability to supply power to weak AC systems, inability to achieve passive operation, and consumption of a large amount of reactive power during operation, which to a certain extent restricts its further development.

[0005] The core of the existing traditional DC power transmission converter valve is the converter valve component. The core power device used in the converter valve component is the thyristor. The thyristor is called a semi-controlled device, which can only control the conduction of the thyristor and cannot control its turn-off, and does not have the ability to block current when a DC system fails. Summary of the Invention

[0006] In view of the above problems, the present invention provides an IGCT component structure for a converter valve, adopting the following technical solutions:

[0007] An IGCT component structure for a converter valve includes a valve component and a press-fitting component, and the press-fitting component is used to press-fit and fix the valve component; wherein, the valve component includes n IGCT devices, n + 1 water-cooled radiators, 2n static voltage-sharing resistors, n lightning arresters, and 4n damping resistors, where n is a positive integer; the n IGCT devices and the n + 1 water-cooled radiators are stacked, the n + 1 water-cooled radiators form n gaps, and the n IGCT devices are correspondingly arranged in the n gaps; the 2n static voltage-sharing resistors and the 4n damping resistors are both arranged on the water-cooled radiators; each lightning arrester is connected to the water-cooled radiator through a first connection busbar.

[0008] Further, the 2n static voltage-sharing resistors are respectively arranged on the 1st to the nth water-cooled radiators.

[0009] Further, one static voltage equalizing resistor is provided on each of the first side and the second side of the 1st to nth water-cooled radiators.

[0010] Further, when n is an even number, every two lightning arresters are connected to the third side of one water-cooled radiator through one second connecting busbar.

[0011] Further, the 4n damping resistors are respectively arranged on the 1st to n+1th water-cooled radiators.

[0012] Further, two damping resistors are arranged on the first side of the 1st water-cooled radiator and the first side of the n+1th water-cooled radiator, and four damping resistors are arranged on the first side of the 2nd to nth water-cooled radiators.

[0013] Further, the press-fitting component includes a first side plate, a second side plate, a pressing component, a first insulating backing plate, a pull rod component, a second insulating backing plate and an adjusting component;

[0014] Wherein, the first side plate is detachably connected to the second side plate through the pull rod component, the pressing component is arranged on the first side plate, the adjusting component is arranged on the second side plate, and the pressing component presses the first insulating backing plate, the valve component and the second insulating backing plate in sequence between the first side plate and the adjusting component.

[0015] Further, the adjusting component includes a connecting nut and an adjusting bolt;

[0016] Wherein, a second round hole is provided in the middle of the second side plate, the connecting nut is arranged inside the second side plate and is concentric with the second round hole, the screw rod of the adjusting bolt is threadedly connected to the connecting nut, and the head of the adjusting bolt abuts against the second insulating backing plate.

[0017] Further, two second connecting busbars are further included. One end of one second connecting busbar is press-fitted between the first insulating backing plate and the first water-cooled radiator, and one end of the other second connecting busbar is press-fitted between the second insulating backing plate and the n+1th water-cooled radiator.

[0018] Further, the second connecting busbar is in an L shape.

[0019] Further, the first side and the second side are two opposite sides of the water-cooled radiator.

[0020] Further, the internal structure of the IGCT device includes a gate drive and an energy extraction circuit.

[0021] Advantages of the present invention:

[0022] 1. The valve assembly of the present invention uses IGCT devices to solve the problem of commutation failure in DC transmission technology. The IGCT devices have the characteristics of strong current-carrying capacity, low on-state voltage drop, short-circuit failure characteristics, and high series reliability. At the same time, the IGCT devices are fully controlled devices, which can realize controlled conduction and turn-off. When a fault occurs in the DC system, it can also be used as a DC circuit breaker, with strong controllability.

[0023] 2. The present invention is designed with integration. All devices are reasonably arranged and pressed in the mounting components, making the structure more compact, reasonable, and beautiful. The static voltage-sharing resistors, lightning arresters, and damping resistors are all distributed on multiple water-cooled radiators. The reasonable layout makes the overall structure occupy a small area, and the water-cooled radiators are used to dissipate heat for multiple devices such as IGCT devices, static voltage-sharing resistors, lightning arresters, and damping resistors at the same time, fully utilizing the heat dissipation function of the water-cooled radiators, reducing the complexity of the valve assembly and the manufacturing cost.

[0024] Other features and advantages of the present invention will be described in the following specification, and some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structure pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 An isometric view showing the structure of an IGCT assembly for a converter valve according to an embodiment of the present invention;

[0027] Figure 2 A schematic installation view showing the IGCT device and the water-cooled radiator according to an embodiment of the present invention;

[0028] Figure 3 A schematic installation view showing the second connection busbar according to an embodiment of the present invention;

[0029] Figure 4 A schematic installation view showing the static voltage-sharing resistor according to an embodiment of the present invention.

[0030] In the figure: 1. IGCT device; 2. Static voltage-sharing resistor; 3. Lightning arrester; 4. Damping resistor; 5. Water-cooled radiator; 6. Second connection busbar; 7. First connection busbar; 8. Heat dissipation water pipe; 9. First side plate; 10. Second side plate; 11. Pressing assembly; 12. Tie rod assembly; 13. Adjusting assembly. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in this application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present application described herein. In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings.

[0033] The embodiments of the present invention provide an IGCT (Intergrated Gate Commutated Thyristors) component structure for a converter valve, based on a new reverse-blocking IGCT device 1, to solve the problem of commutation failure in DC transmission technology.

[0034] An IGCT component structure for a converter valve includes a valve component and a press-fitting component, and the press-fitting component is used to press-fit and fix the valve component.

[0035] As Figure 1 shown, the valve component includes n IGCT devices 1, n + 1 water-cooled radiators 5, 2n static voltage-sharing resistors 2, n arresters 3 (MOV), and 4n damping resistors 4, where n is a positive integer.

[0036] The selected electronic power core device of the valve component in the embodiments of the present invention is an IGCT, which has the characteristics of strong current-carrying capacity, low on-state voltage drop, short-circuit failure characteristics, and high series reliability. The differences among the IGCT devices 1 are small, which to a certain extent ensures series voltage sharing.

[0037] At the same time, the IGCT device 1 is a fully controlled device, which can realize controlled conduction and turn-off, and can also be used as a DC circuit breaker when a DC system fails.

[0038] Among them, n IGCT devices 1 and n + 1 water-cooled radiators 5 are stacked. The n + 1 water-cooled radiators 5 form n gaps, and the n IGCT devices 1 are correspondingly arranged in the n gaps one by one. The two end faces of the IGCT device 1 in each gap are in contact with the adjacent two water-cooled radiators 5.

[0039] The internal structure of the IGCT device 1 includes a gate drive and an energy extraction circuit, without external drive and power supply, greatly saving the installation space, reducing the current path, and effectively improving the reliability of the device.

[0040] 2n static voltage-sharing resistors 2 are all arranged on the water-cooled radiator 5. For example, the 2n static voltage-sharing resistors 2 are respectively arranged on the 1st to the nth water-cooled radiators 5. For example, as Figure 1 and Figure 4 shown, one static voltage-sharing resistor 2 is arranged on each of the first side and the second side of the 1st to the nth water-cooled radiators 5. For example, the first side and the second side are two opposite sides of the water-cooled radiator 5.

[0041] After the static voltage-sharing resistors 2 of the embodiment of the present invention are installed on both sides of the water-cooled radiator 5, they are connected together by wires, which can not only dissipate heat well, but also be convenient for wiring.

[0042] As Figure 1 shown, each lightning arrester 3 is connected to the water-cooled radiator 5 through a first connection busbar 7. For example, when n is an even number, every 2 lightning arresters 3 are connected to the third side (outer side) of one water-cooled radiator 5 through 1 second connection busbar 6, saving space and making the structure compact.

[0043] A lightning arrester 3 is also installed outside the valve assembly of the embodiment of the present invention, which can effectively prevent current impact during operation. The lightning arrester 3 is fixed to the water-cooled radiator 5 through the first connection busbar 7, which can not only be reliably fixed, but also has a low stray current-carrying capacity.

[0044] As Figure 1 shown, 4n damping resistors 4 are all arranged on the water-cooled radiator 5. For example, the 4n damping resistors 4 are respectively arranged on the 1st to the n + 1th water-cooled radiators 5. For example, 2 damping resistors 4 are arranged on the first side of the 1st water-cooled radiator 5 and the first side of the n + 1th water-cooled radiator 5, and 4 damping resistors 4 are arranged on the first side of the 2nd to the nth water-cooled radiators 5.

[0045] As Figure 1 and Figure 2As shown, for example, n + 1 water-cooled radiators 5 are grouped for water circuit arrangement. The n + 1 water-cooled radiators 5 are divided into m groups. Each group of water-cooled radiators 5 includes 3 or 4 water-cooled radiators 5 connected in series in the water circuit. Each group of water-cooled radiators 5 has an inlet and an outlet. The water circuits are connected through heat dissipation water pipes 8. The inside of the pipes is deionized water, which has no electrical conductivity. When the IGCT device 1 works, heat is conducted from the water to the outside through the water-cooled radiator 5. The water-cooled radiator 5 not only plays a role in heat dissipation but also has current-carrying capacity, and can conduct the current of the IGCT device 1 to the next stage.

[0046] As Figure 2 As shown, for example, the valve assembly includes 12 IGCT devices 1, 13 water-cooled radiators 5, 24 static voltage-sharing resistors 2, 12 lightning arresters 3 (MOV) and 48 damping resistors 4. The 13 water-cooled radiators 5 form 12 gaps. One IGCT device 1 is arranged in each gap. One static voltage-sharing resistor 2 is arranged on each of the first side and the second side of the first to twelfth water-cooled radiators 5. Every two lightning arresters 3 are connected to the third side of one water-cooled radiator 5 through one first connection busbar 7. Two damping resistors 4 are arranged on the first side of the first water-cooled radiator 5 and the first side of the thirteenth water-cooled radiator 5. Four damping resistors 4 are arranged on the first side of the second to twelfth water-cooled radiators 5.

[0047] For example, as Figure 1 and Figure 2 As shown, the press-fitting component includes a first side plate 9, a second side plate 10, a pressing component 11, a first insulating backing plate, a tie rod component 12, a second insulating backing plate and an adjusting component 13.

[0048] Among them, the first side plate 9 is detachably connected to the second side plate 10 through the tie rod component 12. The pressing component 11 is arranged on the first side plate 9. The adjusting component 13 is arranged on the second side plate 10. The pressing component 11 presses the first insulating backing plate, the valve assembly and the second insulating backing plate in sequence between the first side plate 9 and the adjusting component 13.

[0049] It should be noted that the positions of the pressing component 11 and the adjusting component 13 can be interchanged, that is, the pressing component 11 can also be arranged on the second side plate 10, and the adjusting component 13 can be arranged on the first side plate 9.

[0050] The press-fitting component fixes the first side plate 9 and the second side plate 10 together through the tie rod component 12, presses the IGCT device 1 and the water-cooled radiator 5 together through the pressing component 11. The adjusting component 13 is used for distance compensation adjustment between the valve assembly and the first insulating backing plate and the second insulating backing plate, which is convenient for installation and makes the press-fitting component have a wide application range.

[0051] For example, a first round hole is provided in the middle of the first side plate 9. The pressing component 11 includes a movable block, a disc spring and a plug. The movable block is cylindrical. A stepped surface is provided at the lower end of the movable block. The upper end of the movable block is slidably connected to the first round hole of the first side plate 9. A disc spring is sleeved on the movable block, and the disc spring is arranged between the first side plate 9 and the stepped surface of the movable block. A threaded hole is provided in the middle of the movable block, the plug is provided with an external thread, and the plug is threadedly connected to the movable block.

[0052] In this embodiment, the pressure of the disc spring can be corrected separately according to the requirements of the device. The pressure value of the disc spring is formulated according to the requirements of the IGCT device 1. The pressing component presses the disc spring tightly by rotating the plug to generate pressure, and presses and packages n IGCT devices 1 and n + 1 water-cooled radiators 5 together. The plug is threadedly connected to the movable block. When the devices of the power module need to be replaced, the position of the plug can be adjusted to remove the overall pressure of the module for replacement and maintenance. When reinstalling, as long as the thread is tightened, the devices of the valve component can be pressed and installed, which is beneficial to space placement, installation and maintenance.

[0053] For example, as Figure 1 shown, the tie rod assembly 12 includes 4 tie rods, 4 first joints and 4 second joints. One first joint is provided at the first end of each tie rod, and one second joint is provided at the second end of each tie rod. The 4 tie rods are respectively connected to the first side plate 9 through 4 first joints, and the 4 tie rods are connected to the second side plate 10 through 4 second joints. The telescopic lengths of the first joint and the second joint can be adjusted, so that the distance between the first side plate 9 and the second side plate 10 can be adjusted through the tie rod assembly 12.

[0054] For example, the adjusting component 13 includes a connecting nut and an adjusting bolt. A second round hole is provided in the middle of the second side plate 10. The connecting nut is arranged inside the second side plate 10 and is concentric with the second round hole. The screw rod of the adjusting bolt is threadedly connected to the connecting nut, and the head of the adjusting bolt abuts against the second insulating pad. By rotating the adjusting bolt, the distance between the second insulating pad and the first insulating pad can be adjusted, which can compensate for the assembly error and manufacturing dimension error of each device, and together with the pressing component 11, ensure that the pressing pressure of the IGCT device 1 meets the requirements.

[0055] For example, as Figures 1-3 shown, the IGCT component structure for the converter valve further includes 2 second connecting busbars 6. One end of one second connecting busbar 6 is press-fitted between the first insulating pad and the first water-cooled radiator 5, and one end of the other second connecting busbar 6 is press-fitted between the second insulating pad and the (n + 1)th water-cooled radiator 5.

[0056] The second connecting busbar 6 serves as the connecting busbar between the valve component and the outside. The second connecting busbar 6 is press-fitted with the water-cooled radiator 5 to perform the current connection function of the valve component.

[0057] For example, the second connecting busbar 6 is L-shaped. One end of the second connecting busbar 6 is press-fitted with the water-cooled radiator 5, and the other end of the second connecting busbar 6 is perpendicular to the first side plate 9 or the second side plate 10, further saving space and facilitating wiring and installation.

[0058] The IGCT component structure for a converter valve according to an embodiment of the present invention can be used in DC transmission projects with various voltage levels, and has the advantages of high reliability, strong controllability, and low cost.

[0059] The IGCT component structure design for a converter valve according to an embodiment of the present invention is integrated. All devices and components are reasonably arranged in a press-fitting component, and the structure is more compact, reasonable, and beautiful. The static voltage-sharing resistors 2, surge arresters 3, and damping resistors 4 are all distributed on multiple water-cooled radiators 5. The reasonable layout makes the overall structure occupy a small area and is convenient for installation and transportation.

[0060] The water-cooled radiator 5 simultaneously dissipates heat for multiple devices such as the IGCT device 1, static voltage-sharing resistor 2, surge arrester 3, and damping resistor 4, improving the system reliability, making full use of the heat dissipation function of the water-cooled radiator 5, reducing the complexity of the valve component, and reducing the manufacturing cost.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An IGCT component structure for a commutation valve, characterized in that, it includes a valve component and a press-fitting component, and the press-fitting component is used to press-fit and fix the valve component; wherein, the valve component includes n IGCT devices (1), n + 1 water-cooled radiators (5), 2n static voltage-sharing resistors (2), n lightning arresters (3) and 4n damping resistors (4), and n is a positive integer; The n IGCT devices (1) and the n + 1 water-cooled radiators (5) are stacked, the n + 1 water-cooled radiators (5) form n gaps, and the n IGCT devices (1) are correspondingly arranged in the n gaps; the 2n static voltage-sharing resistors (2) and the 4n damping resistors (4) are both arranged on the water-cooled radiator (5); each lightning arrester (3) is connected to the water-cooled radiator (5) through a first connecting busbar (7).

2. The IGCT component structure for a commutation valve according to claim 1, characterized in that, the 2n static voltage-sharing resistors (2) are respectively arranged on the 1st to the nth water-cooled radiators (5).

3. The IGCT component structure for a commutation valve according to claim 2, characterized in that, one static voltage-sharing resistor (2) is arranged on each of the first side and the second side of the 1st to the nth water-cooled radiators (5).

4. The IGCT component structure for a commutation valve according to claim 1, characterized in that, when n is an even number, every two lightning arresters (3) are connected to the third side of one water-cooled radiator (5) through one second connecting busbar (6).

5. The IGCT component structure for a commutation valve according to claim 1, characterized in that, the 4n damping resistors (4) are respectively arranged on the 1st to the n + 1th water-cooled radiators (5).

6. The IGCT component structure for a commutation valve according to claim 5, characterized in that, two damping resistors (4) are arranged on the first side of the 1st water-cooled radiator (5) and the first side of the n + 1th water-cooled radiator (5), and four damping resistors (4) are arranged on the first side of the 2nd to the nth water-cooled radiators (5).

7. The IGCT component structure for a commutation valve according to claim 1, characterized in that, the press-fitting component includes a first side plate (9), a second side plate (10), a pressing component (11), a first insulating backing plate, a tie rod component (12), a second insulating backing plate and an adjusting component (13); wherein, the first side plate (9) is detachably connected to the second side plate (10) through the tie rod component (12), the pressing component (11) is arranged on the first side plate (9), the adjusting component (13) is arranged on the second side plate (10), and the pressing component (11) presses the first insulating backing plate, the valve component and the second insulating backing plate in sequence between the first side plate (9) and the adjusting component (13).

8. The IGCT component structure for a commutation valve according to claim 7, characterized in that, the adjusting component (13) includes a connecting nut and an adjusting bolt; Among them, a second round hole is provided in the middle of the second side plate (10), the connecting nut is arranged inside the second side plate (10) and is concentric with the second round hole, the screw rod of the adjusting bolt is threadedly connected with the connecting nut, and the head of the adjusting bolt abuts against the second insulating pad.

9. The IGCT component structure for a converter valve according to any one of claims 1-8, characterized in that, it further comprises 2 second connecting busbars (6), one end of one second connecting busbar (6) is press-fitted between the first insulating pad and the first water-cooled radiator (5), and one end of the other second connecting busbar (6) is press-fitted between the second insulating pad and the (n + 1)-th water-cooled radiator (5).

10. The IGCT component structure for a converter valve according to claim 9, characterized in that, the second connecting busbar (6) is in an L shape.

11. The IGCT component structure for a converter valve according to claim 3, characterized in that, the first side and the second side are two opposite sides of the water-cooled radiator (5).

12. The IGCT component structure for a converter valve according to claim 1, characterized in that, the internal structure of the IGCT device (1) includes a gate drive and an energy extraction circuit.

Images